1 #ifndef _ASM_X86_MSHYPER_H
2 #define _ASM_X86_MSHYPER_H
4 #include <linux/types.h>
5 #include <linux/atomic.h>
8 #include <asm/hyperv.h>
11 * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
12 * is set by CPUID(HVCPUID_VERSION_FEATURES).
14 enum hv_cpuid_function
{
15 HVCPUID_VERSION_FEATURES
= 0x00000001,
16 HVCPUID_VENDOR_MAXFUNCTION
= 0x40000000,
17 HVCPUID_INTERFACE
= 0x40000001,
20 * The remaining functions depend on the value of
23 HVCPUID_VERSION
= 0x40000002,
24 HVCPUID_FEATURES
= 0x40000003,
25 HVCPUID_ENLIGHTENMENT_INFO
= 0x40000004,
26 HVCPUID_IMPLEMENTATION_LIMITS
= 0x40000005,
29 struct ms_hyperv_info
{
37 extern struct ms_hyperv_info ms_hyperv
;
40 * Declare the MSR used to setup pages used to communicate with the hypervisor.
42 union hv_x64_msr_hypercall_contents
{
47 u64 guest_physical_address
:52;
55 struct ms_hyperv_tsc_page
{
56 volatile u32 tsc_sequence
;
58 volatile u64 tsc_scale
;
59 volatile s64 tsc_offset
;
64 * The guest OS needs to register the guest ID with the hypervisor.
65 * The guest ID is a 64 bit entity and the structure of this ID is
66 * specified in the Hyper-V specification:
68 * msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
70 * While the current guideline does not specify how Linux guest ID(s)
71 * need to be generated, our plan is to publish the guidelines for
72 * Linux and other guest operating systems that currently are hosted
73 * on Hyper-V. The implementation here conforms to this yet
74 * unpublished guidelines.
78 * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
79 * 62:56 - Os Type; Linux is 0x100
80 * 55:48 - Distro specific identification
81 * 47:16 - Linux kernel version number
82 * 15:0 - Distro specific identification
87 #define HV_LINUX_VENDOR_ID 0x8100
90 * Generate the guest ID based on the guideline described above.
93 static inline __u64
generate_guest_id(__u64 d_info1
, __u64 kernel_version
,
98 guest_id
= (((__u64
)HV_LINUX_VENDOR_ID
) << 48);
99 guest_id
|= (d_info1
<< 48);
100 guest_id
|= (kernel_version
<< 16);
107 /* Free the message slot and signal end-of-message if required */
108 static inline void vmbus_signal_eom(struct hv_message
*msg
, u32 old_msg_type
)
111 * On crash we're reading some other CPU's message page and we need
112 * to be careful: this other CPU may already had cleared the header
113 * and the host may already had delivered some other message there.
114 * In case we blindly write msg->header.message_type we're going
115 * to lose it. We can still lose a message of the same type but
116 * we count on the fact that there can only be one
117 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
120 if (cmpxchg(&msg
->header
.message_type
, old_msg_type
,
121 HVMSG_NONE
) != old_msg_type
)
125 * Make sure the write to MessageType (ie set to
126 * HVMSG_NONE) happens before we read the
127 * MessagePending and EOMing. Otherwise, the EOMing
128 * will not deliver any more messages since there is
133 if (msg
->header
.message_flags
.msg_pending
) {
135 * This will cause message queue rescan to
136 * possibly deliver another msg from the
139 wrmsrl(HV_X64_MSR_EOM
, 0);
143 #define hv_init_timer(timer, tick) wrmsrl(timer, tick)
144 #define hv_init_timer_config(config, val) wrmsrl(config, val)
146 #define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
147 #define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
149 #define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
150 #define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
152 #define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
153 #define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
155 #define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
157 #define hv_get_synint_state(int_num, val) rdmsrl(int_num, val)
158 #define hv_set_synint_state(int_num, val) wrmsrl(int_num, val)
160 void hyperv_callback_vector(void);
161 #ifdef CONFIG_TRACING
162 #define trace_hyperv_callback_vector hyperv_callback_vector
164 void hyperv_vector_handler(struct pt_regs
*regs
);
165 void hv_setup_vmbus_irq(void (*handler
)(void));
166 void hv_remove_vmbus_irq(void);
168 void hv_setup_kexec_handler(void (*handler
)(void));
169 void hv_remove_kexec_handler(void);
170 void hv_setup_crash_handler(void (*handler
)(struct pt_regs
*regs
));
171 void hv_remove_crash_handler(void);
173 #if IS_ENABLED(CONFIG_HYPERV)
174 extern struct clocksource
*hyperv_cs
;
175 extern void *hv_hypercall_pg
;
177 static inline u64
hv_do_hypercall(u64 control
, void *input
, void *output
)
179 u64 input_address
= input
? virt_to_phys(input
) : 0;
180 u64 output_address
= output
? virt_to_phys(output
) : 0;
182 register void *__sp
asm(_ASM_SP
);
185 if (!hv_hypercall_pg
)
188 __asm__
__volatile__("mov %4, %%r8\n"
190 : "=a" (hv_status
), "+r" (__sp
),
191 "+c" (control
), "+d" (input_address
)
192 : "r" (output_address
), "m" (hv_hypercall_pg
)
193 : "cc", "memory", "r8", "r9", "r10", "r11");
195 u32 input_address_hi
= upper_32_bits(input_address
);
196 u32 input_address_lo
= lower_32_bits(input_address
);
197 u32 output_address_hi
= upper_32_bits(output_address
);
198 u32 output_address_lo
= lower_32_bits(output_address
);
200 if (!hv_hypercall_pg
)
203 __asm__
__volatile__("call *%7"
205 "+c" (input_address_lo
), "+r" (__sp
)
207 "b" (input_address_hi
),
208 "D"(output_address_hi
), "S"(output_address_lo
),
209 "m" (hv_hypercall_pg
)
215 #define HV_HYPERCALL_RESULT_MASK GENMASK_ULL(15, 0)
216 #define HV_HYPERCALL_FAST_BIT BIT(16)
217 #define HV_HYPERCALL_VARHEAD_OFFSET 17
218 #define HV_HYPERCALL_REP_COMP_OFFSET 32
219 #define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32)
220 #define HV_HYPERCALL_REP_START_OFFSET 48
221 #define HV_HYPERCALL_REP_START_MASK GENMASK_ULL(59, 48)
223 /* Fast hypercall with 8 bytes of input and no output */
224 static inline u64
hv_do_fast_hypercall8(u16 code
, u64 input1
)
226 u64 hv_status
, control
= (u64
)code
| HV_HYPERCALL_FAST_BIT
;
227 register void *__sp
asm(_ASM_SP
);
231 __asm__
__volatile__("call *%4"
232 : "=a" (hv_status
), "+r" (__sp
),
233 "+c" (control
), "+d" (input1
)
234 : "m" (hv_hypercall_pg
)
235 : "cc", "r8", "r9", "r10", "r11");
239 u32 input1_hi
= upper_32_bits(input1
);
240 u32 input1_lo
= lower_32_bits(input1
);
242 __asm__
__volatile__ ("call *%5"
248 "m" (hv_hypercall_pg
)
249 : "cc", "edi", "esi");
256 * Rep hypercalls. Callers of this functions are supposed to ensure that
257 * rep_count and varhead_size comply with Hyper-V hypercall definition.
259 static inline u64
hv_do_rep_hypercall(u16 code
, u16 rep_count
, u16 varhead_size
,
260 void *input
, void *output
)
266 control
|= (u64
)varhead_size
<< HV_HYPERCALL_VARHEAD_OFFSET
;
267 control
|= (u64
)rep_count
<< HV_HYPERCALL_REP_COMP_OFFSET
;
270 status
= hv_do_hypercall(control
, input
, output
);
271 if ((status
& HV_HYPERCALL_RESULT_MASK
) != HV_STATUS_SUCCESS
)
274 /* Bits 32-43 of status have 'Reps completed' data. */
275 rep_comp
= (status
& HV_HYPERCALL_REP_COMP_MASK
) >>
276 HV_HYPERCALL_REP_COMP_OFFSET
;
278 control
&= ~HV_HYPERCALL_REP_START_MASK
;
279 control
|= (u64
)rep_comp
<< HV_HYPERCALL_REP_START_OFFSET
;
281 touch_nmi_watchdog();
282 } while (rep_comp
< rep_count
);
288 * Hypervisor's notion of virtual processor ID is different from
289 * Linux' notion of CPU ID. This information can only be retrieved
290 * in the context of the calling CPU. Setup a map for easy access
291 * to this information.
293 extern u32
*hv_vp_index
;
296 * hv_cpu_number_to_vp_number() - Map CPU to VP.
297 * @cpu_number: CPU number in Linux terms
299 * This function returns the mapping between the Linux processor
300 * number and the hypervisor's virtual processor number, useful
301 * in making hypercalls and such that talk about specific
304 * Return: Virtual processor number in Hyper-V terms
306 static inline int hv_cpu_number_to_vp_number(int cpu_number
)
308 return hv_vp_index
[cpu_number
];
311 void hyperv_init(void);
312 void hyperv_setup_mmu_ops(void);
313 void hyper_alloc_mmu(void);
314 void hyperv_report_panic(struct pt_regs
*regs
);
315 bool hv_is_hypercall_page_setup(void);
316 void hyperv_cleanup(void);
317 #else /* CONFIG_HYPERV */
318 static inline void hyperv_init(void) {}
319 static inline bool hv_is_hypercall_page_setup(void) { return false; }
320 static inline void hyperv_cleanup(void) {}
321 static inline void hyperv_setup_mmu_ops(void) {}
322 #endif /* CONFIG_HYPERV */
324 #ifdef CONFIG_HYPERV_TSCPAGE
325 struct ms_hyperv_tsc_page
*hv_get_tsc_page(void);
326 static inline u64
hv_read_tsc_page(const struct ms_hyperv_tsc_page
*tsc_pg
)
328 u64 scale
, offset
, cur_tsc
;
332 * The protocol for reading Hyper-V TSC page is specified in Hypervisor
333 * Top-Level Functional Specification ver. 3.0 and above. To get the
334 * reference time we must do the following:
335 * - READ ReferenceTscSequence
336 * A special '0' value indicates the time source is unreliable and we
337 * need to use something else. The currently published specification
338 * versions (up to 4.0b) contain a mistake and wrongly claim '-1'
339 * instead of '0' as the special value, see commit c35b82ef0294.
341 * ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
342 * - READ ReferenceTscSequence again. In case its value has changed
343 * since our first reading we need to discard ReferenceTime and repeat
344 * the whole sequence as the hypervisor was updating the page in
348 sequence
= READ_ONCE(tsc_pg
->tsc_sequence
);
352 * Make sure we read sequence before we read other values from
357 scale
= READ_ONCE(tsc_pg
->tsc_scale
);
358 offset
= READ_ONCE(tsc_pg
->tsc_offset
);
359 cur_tsc
= rdtsc_ordered();
362 * Make sure we read sequence after we read all other values
367 } while (READ_ONCE(tsc_pg
->tsc_sequence
) != sequence
);
369 return mul_u64_u64_shr(cur_tsc
, scale
, 64) + offset
;
373 static inline struct ms_hyperv_tsc_page
*hv_get_tsc_page(void)